P205A: Reductant Tank Temperature Sensor A Circuit
Standardized SAE J2012 code · P20xx — Fuel & air metering and auxiliary emission controls
What does P205A mean?
A general electrical fault is reported on DEF tank temperature sensor A — separate from the metering-unit temperature sensor and used to gate tank-heating.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Check engine light or NOx warning on
- AdBlue/DEF level or quality warning
- Possible no-start countdown after ignore period
- Failed emissions inspection (NOx)
Common causes
- High Sensor element failed
- Medium Harness fault
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P205A on the same make and model first.
P205A in the community
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